The Evaluation Of The Marginal Microleakage Of Class-? Restorations With SonicFill^TM Composite Under Self-etch And Selective Enamel Etch Conditions,A Vitro Study

Objective To evaluate the marginal microleakage of class-? restorations separately with SonicFillTM composite and 3M FiltekTM Z350 composite under self-etch and selective enamel etch conditions.Methods Class-? cavities were prepared in 48 molars and randomly divided into 4 groups according to different composites and etch ways(n=12):Group A:Self-etch with 3M single bond Universal adhesive + 3M FiltekTM Z350;Group B:Selective enamel etch + 3M single bond Universal adhesive + 3M FiltekTM Z350;Group C:Self-etch with Kerr Optibond Versa adhesive + SonicFillTM composite;Group D:Selective enamel etch + Kerr Optibond Versa adhesive + SonicFillTM composite.After thermocycling,the specimens were submitted to Methylene blue for 24 hours.Then each sample was sectioned into 4 pieces in mesio-distal direction.Dye penetrations were examined under stereomicroscope.Results The differences which were statistically significant with the microleakage of gingival wall were Group B less than Group A(P=0.005),Group D less than Group C(P=0.017),Group C less than Group A(P=0.001)and Group D less than Group B(P=0.005).And the differences which were statistically significant with the microleakage of side wall were Group B less than Group A(P=0.000),Group D less than Group C(P=0.000),Group C less than Group A(P=0.000)and Group D less than Group B(P=0.011).Conclusions Conclusions SonicFillTM composite has been found less microleakage of class-? restorations in posterior teeth than 3M FiltekTM Z350 composite.And it is suggested to use selective enamel etching to reduce the marginal microleakage while filling posterior teeth with big cavities.